<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.d3{
				position: fixed;
				right: 10px;
				bottom: 10px;
				border: solid 1px gray;
				width: 100px;
				height: 100px;
				line-height: 100px;
				text-align: center;
			}
		</style>
	</head>
	<body>
		
		<div>
			内容1
			<div>
				内容2
				<div class="d3">
					内容3
				</div>
				内容4
			</div>
			
		</div>
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	</body>
</html>
